Upper-air flow indicates the warm front should move back north of Chicago later in the afternoon or more likely tonight.
However this incursion of cooler, drier air will briefly put the northeast corner of Illinois and Chicago in a more stable – mini-high pressure situation – minimizing the chances of showers thunderstorms this afternoon. Another upper-level impulse will likely move out of the plains this evening or overnight, pulling the warm front north and triggering a renewed thunderstorm outbreak over Iowa that should then move east into northern Illinois.
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